1. • noun - a plane figure bounded by two radii and the included arc of a circle
   • noun - a social group that forms part of the society or the economy
   • noun - a particular aspect of life or activity
   • noun - the minimum track length that can be assigned to store information
   • noun - a portion of a military position
   • noun - measuring instrument consisting of two graduated arms hinged at one end
2. • Mathematics.
   • The portion of a circle bounded by two radii and the included arc.
   • A measuring instrument consisting of two graduated arms hinged together at one end.
   • A division of a defensive position for which one military unit is responsible.
   • A division of an offensive military position.
   • A part or division, as of a city or a national economy: the manufacturing sector; the private sector.
   • A bit or a set of bits on a magnetic storage device making up the smallest addressable unit of information.
3. • v - to divide into sectors (sections)

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